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import curses
import sys
import time
import token
import tokenize
from story3.node import alt_repr
class Visualizer:
def __init__(self):
self.offsets = [0]
self.cursor_x = 0
self.stack = []
self.cache = []
self.w = curses.initscr()
curses.noecho()
self.w.keypad(True)
self.vis_tokens([], 0)
def close(self):
curses.echo()
curses.endwin()
def wait(self):
if chr(self.w.getch()) in 'qQ':
sys.exit(0)
def vis_tokens(self, tokens, pos):
w = self.w
symbols = []
for t in tokens:
s = alt_repr(t)
symbols.append(s)
self.symbols = symbols
offset = 0
offsets = [offset]
for s in symbols:
offset += len(s) + 1
offsets.append(offset)
self.offsets = offsets
self.cursor_x = offsets[pos]
def display_stack(self):
w = self.w
w.move(0, 0)
w.clrtobot()
y = (curses.LINES // 2 - 1) - len(self.stack)
clip = 0
if y < 0:
clip = -y
y = 0
for (pos, s, res), rule in self.stack[clip:]:
if rule and not res:
name, alts, indices = rule
x = self.offsets[pos]
w.move(y, x)
w.addnstr(name + ":", curses.COLS - x)
y, x = w.getyx()
if not indices:
indices = 0, 0, 0
alt_index, item_index, num_items = indices
for alt_i, alt in enumerate(alts):
if alt_i > 0:
w.addnstr(" |", curses.COLS - x)
y, x = w.getyx()
for item_i, item in enumerate(alt):
if alt_i == alt_index and item_index < item_i < item_index + num_items:
attr = curses.A_UNDERLINE
else:
attr = 0
w.addnstr(" ", curses.COLS - x, attr)
y, x = w.getyx()
if alt_i == alt_index and item_index <= item_i < item_index + num_items:
attr = curses.A_UNDERLINE
else:
attr = 0
w.addnstr(item, curses.COLS - x, attr)
y, x = w.getyx()
else:
if self.offsets[pos] >= curses.COLS:
continue
if res:
s += " -> " + res
w.addnstr(y, self.offsets[pos], s, curses.COLS - self.offsets[pos])
y += 1
w.addstr(y, 0, "-"*curses.COLS)
y += 1
cursor_y = y
w.addnstr(y, 0, " ".join(self.symbols), curses.COLS)
y += 1
w.addstr(y, 0, "-"*curses.COLS)
y += 1
y += 1
for pos, s, res in reversed(self.cache):
if y >= curses.LINES:
break
if self.offsets[pos] >= curses.COLS:
continue
if res:
s += " -> " + res
w.addnstr(y, self.offsets[pos], s, curses.COLS - self.offsets[pos])
y += 1
w.move(cursor_y, min(curses.COLS - 1, self.cursor_x))
self.wait()
def show_call(self, pos, name, args):
while self.stack and self.stack[-1][0][-1]:
val, rule = self.stack.pop()
if val in self.cache:
self.cache.remove(val)
self.cache.append(val)
w = self.w
if name == 'expect' and len(args) == 1:
if isinstance(args[0], int):
s = f"{name}({token.tok_name.get(args[0], str(args[0]))})"
else:
s = f"{name}({args[0]!r})"
else:
s = name + str(args)
self.stack.append(((pos, s, None), None))
self.display_stack()
def show_rule(self, name, alts):
i = len(self.stack) - 1
while i >= 0 and self.stack[i][0][-1]:
i -= 1
top, rule = self.stack[i]
rule = (name, alts, None)
self.stack[i] = (top, rule)
self.display_stack()
def show_index(self, alt_index, item_index, num_items):
i = len(self.stack) - 1
while i >= 0 and self.stack[i][0][-1]:
i -= 1
top, rule = self.stack[i]
name, alts, indices = rule
new_rule = (name, alts, (alt_index, item_index, num_items))
if new_rule != rule:
self.stack[i] = top, new_rule
self.display_stack()
def show_return(self, pos, res, endpos):
i = len(self.stack) - 1
while i >= 0 and self.stack[i][0][-1]:
i -= 1
top, rule = self.stack[i]
top_pos, top_s, top_res = top
top_res = alt_repr(res)
top = top_pos, top_s, top_res
self.stack[i] = top, rule
self.display_stack()
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